function area(shape, width, height) {
    var area = width * height;
    return "I'm a " + shape + " with an area of " + area + " cm squared.";
}
console.log(area("长方形", 5, 6));
function greeter(person) {
    return "Hello," + person.firstName + " " + person.lastName;
}
var user = { firstName: 'fjq', lastName: 'fff' };
greeter(user);
